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    "tun_wg0: loop detected" following WireGuard gateway 100% loss and WAN interface rc.newwanip

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    • stephenw10S
      stephenw10 Netgate Administrator @Mixka
      last edited by

      @mixka said in "tun_wg0: loop detected" following WireGuard gateway 100% loss and WAN interface rc.newwanip:

      Should I try dumb switch before WAN interface and what difference it might doing?

      That's unlikely to help here because, AFAIK, you are not seeing igb0 actually lose link which is what that would prevent.
      It would still hit whatever is causing it to see a new WAN IP triggering the reload of the interface and everything on it.

      Reviewing the thread though, this seems odd:
      @mixka said in "tun_wg0: loop detected" following WireGuard gateway 100% loss and WAN interface rc.newwanip:

      I pin down problem that they all was behind same dummy switch. I restarted that switch and everything worked like 2 minutes and then goes down. I removed that switch and everything back to normal.

      Could it be that switch has some loop detection and was shutting down one or more ports to prevent it?
      If so that implies whatever is creating the loop ends up sending traffic to the LAN side incorrectly.

      Try checking the routing tables when it's working and compare that to the failed state.

      Steve

      M 3 Replies Last reply Reply Quote 0
      • M
        Mixka @stephenw10
        last edited by Mixka

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        • M
          Mixka
          last edited by

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          • M
            Mixka @stephenw10
            last edited by

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            • M
              Mixka @stephenw10
              last edited by Mixka

              @stephenw10

              I have now connected one host directly to pfSense interface and deleted every VLAN and unnecessary interface. So every switch is out. Problem still exist.

              How I can check routing tables when problem occur? It last under minute. Maybe I remove interface monitoring, so it won't recover from loop.

              Also do you know if these settings are ok for eliminating buffer bloat? https://forum.netgate.com/topic/112527/playing-with-fq_codel-in-2-4/775

              Aug 15 11:19:08 	dhclient 	20300 	Creating resolv.conf
Aug 15 11:19:08 	dhclient 	20119 	Adding new routes to interface: igb0
Aug 15 11:19:08 	dhclient 	19776 	New Routers (igb0): WAN_GW_IP
Aug 15 11:19:08 	dhclient 	19433 	New Broadcast Address (igb0): WAN_255_IP
Aug 15 11:19:08 	dhclient 	19284 	New Subnet Mask (igb0): 255.255.240.0
Aug 15 11:19:08 	dhclient 	19165 	New IP Address (igb0): WAN_IP
Aug 15 11:19:08 	dhclient 	18956 	ifconfig igb0 inet WAN_IP netmask 255.255.240.0 broadcast WAN_255_IP
Aug 15 11:19:08 	dhclient 	18914 	Starting add_new_address()
Aug 15 11:19:08 	dhclient 	18658 	BOUND
Aug 15 11:19:08 	dhclient 	18543 	ARPCHECK
Aug 15 11:19:05 	dhclient 	17989 	ARPSEND
Aug 15 11:19:05 	dhclient 	17554 	PREINIT
Aug 15 11:19:05 	dhclient 	16730 	Deleting old routes
Aug 15 11:19:05 	dhclient 	16311 	EXPIRE

Aug 15 11:19:09 	check_reload_status 	487 	Reloading filter
Aug 15 11:19:09 	php-fpm 	1307 	/rc.newwanip: rc.newwanip: on (IP address: WAN_IP) (interface: WAN1[wan]) (real interface: igb0).
Aug 15 11:19:09 	php-fpm 	1307 	/rc.newwanip: rc.newwanip: Info: starting on igb0.
Aug 15 11:19:08 	check_reload_status 	487 	rc.newwanip starting igb0
Aug 15 11:19:08 	kernel 		tun_wg1: loop detected
Aug 15 11:19:07 	kernel 		tun_wg1: loop detected
Aug 15 11:19:07 	kernel 		arpresolve: can't allocate llinfo for WAN_GW_IP on igb0
Aug 15 11:19:07 	kernel 		tun_wg1: loop detected
Aug 15 11:19:07 	kernel 		tun_wg1: loop detected
Aug 15 11:19:07 	kernel 		arpresolve: can't allocate llinfo for WAN_GW_IP on igb0
Aug 15 11:19:06 	kernel 		tun_wg1: loop detected
Aug 15 11:19:06 	kernel 		arpresolve: can't allocate llinfo for WAN_GW_IP on igb0
Aug 15 11:19:06 	kernel 		tun_wg1: loop detected
Aug 15 11:19:06 	kernel 		arpresolve: can't allocate llinfo for WAN_GW_IP on igb0
              1 Reply Last reply Reply Quote 0
              • stephenw10S
                stephenw10 Netgate Administrator
                last edited by

                Ah, I was just reviewing. Did something change?

                M 1 Reply Last reply Reply Quote 0
                • M
                  Mixka @stephenw10
                  last edited by

                  @stephenw10

                  I did not find anything change in behaviour, if that is what you mean.

                  Now I even tried with different connection. I have 5G router in bridged mode with external IP connected to WAN port. Still seeing loop messages in log:

                  Aug 15 21:16:59 	php 	5817 	[pfBlockerNG] filterlog daemon started
Aug 15 21:16:59 	tail_pfb 	5432 	[pfBlockerNG] Firewall Filter Service started
Aug 15 21:16:59 	lighttpd_pfb 	4636 	[pfBlockerNG] DNSBL Webserver started
Aug 15 21:16:59 	php_pfb 	1738 	[pfBlockerNG] filterlog daemon stopped
Aug 15 21:16:59 	tail_pfb 	1131 	[pfBlockerNG] Firewall Filter Service stopped
Aug 15 21:16:59 	lighttpd_pfb 	872 	[pfBlockerNG] DNSBL Webserver stopped
Aug 15 21:16:59 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] Applied package default settings as necessary.
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] Installed Unbound ACL group (WireGuard).
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] De-installed Unbound ACL group (WireGuard).
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] Installed interface group (WireGuard).
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] De-installed interface group (WireGuard).
Aug 15 21:16:58 	php-fpm 	24315 	/rc.start_packages: Skipping STARTing packages process because previous/another instance is already running
Aug 15 21:16:58 	check_reload_status 	484 	Syncing firewall
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] Installed earlyshellcmd(s).
Aug 15 21:16:58 	check_reload_status 	484 	Syncing firewall
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Configuration Change: (system): [pfSense-pkg-WireGuard] De-installed earlyshellcmd(s).
Aug 15 21:16:58 	php 	73522 	haproxy: started new pid:76645
Aug 15 21:16:58 	php 	73522 	haproxy: reload old pid:60858
Aug 15 21:16:58 	php-fpm 	445 	/rc.start_packages: Restarting/Starting all packages.
Aug 15 21:16:57 	check_reload_status 	484 	Starting packages
Aug 15 21:16:57 	php-fpm 	40603 	/rc.newwanip: pfSense package system has detected an IP change or dynamic WAN reconnection - OLD_WAN_GW_IP -> WAN_IP - Restarting packages.
Aug 15 21:16:57 	check_reload_status 	484 	Starting packages
Aug 15 21:16:57 	php-fpm 	446 	/rc.newwanip: pfSense package system has detected an IP change or dynamic WAN reconnection - OLD_WAN_GW_IP -> WAN_IP - Restarting packages.
Aug 15 21:16:55 	php-fpm 	40603 	/rc.newwanip: Creating rrd update script
Aug 15 21:16:55 	php-fpm 	40603 	/rc.newwanip: Resyncing OpenVPN instances for interface WAN1.
Aug 15 21:16:55 	php-fpm 	446 	/rc.newwanip: Creating rrd update script
Aug 15 21:16:55 	php-fpm 	446 	/rc.newwanip: Resyncing OpenVPN instances for interface WAN1.
Aug 15 21:16:54 	php-fpm 	40603 	/rc.newwanip: phpDynDNS (pfsense.example.fi): No change in my IP address and/or 25 days has not passed. Not updating dynamic DNS entry.
Aug 15 21:16:54 	php-fpm 	90936 	/rc.dyndns.update: phpDynDNS (pfsense.example.fi): No change in my IP address and/or 25 days has not passed. Not updating dynamic DNS entry.
Aug 15 21:16:54 	php-fpm 	446 	/rc.newwanip: phpDynDNS (pfsense): (Success) pfsense updated to WAN_IP
Aug 15 21:16:54 	php-fpm 	446 	/rc.newwanip: phpDynDNS: updating cache file /conf/dyndns_wancloudflare'pfsense.example.fi'0.cache: WAN_IP
Aug 15 21:16:46 	php-fpm 	40603 	/rc.newwanip: IP Address has changed, killing states on former IP Address OLD_WAN_GW_IP.
Aug 15 21:16:46 	check_reload_status 	484 	Reloading filter
Aug 15 21:16:46 	check_reload_status 	484 	updating dyndns wan
Aug 15 21:16:46 	php-fpm 	40603 	/rc.newwanip: Removing static route for monitor 8.8.4.4 and adding a new route through WG_VPN_GW_IP
Aug 15 21:16:46 	php-fpm 	40603 	/rc.newwanip: Removing static route for monitor 8.8.8.8 and adding a new route through WG_VPN_GW_IP
Aug 15 21:16:46 	php-fpm 	40603 	/rc.newwanip: Removing static route for monitor 1.1.1.1 and adding a new route through WAN_GW_IP
Aug 15 21:16:45 	php-fpm 	79596 	/rc.linkup: The command '/usr/local/sbin/unbound -c /var/unbound/unbound.conf' returned exit code '1', the output was '[1660587405] unbound[93610:0] error: bind: address already in use [1660587405] unbound[93610:0] fatal error: could not open ports'
Aug 15 21:16:43 	check_reload_status 	484 	Restarting IPsec tunnels
Aug 15 21:16:43 	check_reload_status 	484 	Restarting IPsec tunnels
Aug 15 21:16:43 	check_reload_status 	484 	updating dyndns GW_VPN3_gw
Aug 15 21:16:43 	check_reload_status 	484 	Restarting OpenVPN tunnels/interfaces
Aug 15 21:16:43 	check_reload_status 	484 	Restarting IPsec tunnels
Aug 15 21:16:43 	check_reload_status 	484 	updating dyndns GW_VPN2_gw
Aug 15 21:16:43 	rc.gateway_alarm 	39811 	>>> Gateway alarm: GW_VPN3_gw (Addr:8.8.8.8 Alarm:1 RTT:0.000ms RTTsd:0.000ms Loss:100%)
Aug 15 21:16:43 	rc.gateway_alarm 	41358 	>>> Gateway alarm: GW_VPN2_gw (Addr:8.8.4.4 Alarm:1 RTT:0.000ms RTTsd:0.000ms Loss:100%)
Aug 15 21:16:43 	kernel 		tun_wg0: loop detected
Aug 15 21:16:43 	kernel 		tun_wg0: loop detected
Aug 15 21:16:42 	kernel 		tun_wg0: loop detected
Aug 15 21:16:42 	kernel 		tun_wg0: loop detected
Aug 15 21:16:42 	kernel 		tun_wg0: loop detected
Aug 15 21:16:42 	php-fpm 	40603 	/rc.newwanip: rc.newwanip: on (IP address: WAN_IP) (interface: WAN1[wan]) (real interface: igb0).
Aug 15 21:16:42 	kernel 		tun_wg0: loop detected
Aug 15 21:16:42 	php-fpm 	40603 	/rc.newwanip: rc.newwanip: Info: starting on igb0.
Aug 15 21:16:41 	kernel 		tun_wg0: loop detected
Aug 15 21:16:41 	kernel 		tun_wg0: loop detected
Aug 15 21:16:41 	check_reload_status 	484 	rc.newwanip starting igb0
Aug 15 21:16:41 	kernel 		tun_wg0: loop detected
Aug 15 21:16:41 	php-fpm 	445 	/rc.dyndns.update: Dynamic DNS (pfsense.example.fi) There was an error trying to determine the public IP for interface - wan (igb0 ).
Aug 15 21:16:41 	php-fpm 	445 	/rc.dyndns.update: Dynamic DNS cloudflare (pfsense.example.fi): IP address could not be extracted from Check IP Service
Aug 15 21:16:41 	kernel 		tun_wg0: loop detected
Aug 15 21:16:41 	php-fpm 	79596 	/rc.linkup: HOTPLUG: Configuring interface wan
Aug 15 21:16:41 	php-fpm 	79596 	/rc.linkup: DEVD Ethernet attached event for wan
Aug 15 21:16:41 	check_reload_status 	484 	Reloading filter
Aug 15 21:16:41 	kernel 		tun_wg0: loop detected
Aug 15 21:16:41 	php-fpm 	445 	/rc.dyndns.update: dpinger: No dpinger session running for gateway GW_VPN3_gw
Aug 15 21:16:41 	kernel 		tun_wg0: loop detected
Aug 15 21:16:41 	php-fpm 	445 	/rc.dyndns.update: dpinger: No dpinger session running for gateway GW_VPN2_gw
Aug 15 21:16:41 	php-fpm 	90936 	/rc.linkup: Removing static route for monitor 8.8.4.4 and adding a new route through WG_VPN_GW_IP
Aug 15 21:16:41 	php-fpm 	90936 	/rc.linkup: Removing static route for monitor 8.8.8.8 and adding a new route through WG_VPN_GW_IP
Aug 15 21:16:40 	php-fpm 	446 	/rc.newwanip: IP Address has changed, killing states on former IP Address OLD_WAN_GW_IP.
Aug 15 21:16:40 	check_reload_status 	484 	Restarting OpenVPN tunnels/interfaces
Aug 15 21:16:40 	check_reload_status 	484 	Restarting IPsec tunnels
Aug 15 21:16:40 	rc.gateway_alarm 	28598 	>>> Gateway alarm: GW_VPN3_gw (Addr:8.8.8.8 Alarm:1 RTT:1858.240ms RTTsd:0.000ms Loss:0%)
Aug 15 21:16:40 	php-fpm 	90936 	/rc.linkup: DEVD Ethernet detached event for wan
Aug 15 21:16:40 	check_reload_status 	484 	Reloading filter
Aug 15 21:16:40 	check_reload_status 	484 	updating dyndns wan
Aug 15 21:16:38 	php-fpm 	446 	/rc.newwanip: Removing static route for monitor 8.8.4.4 and adding a new route through WG_VPN_GW_IP
Aug 15 21:16:38 	php-fpm 	446 	/rc.newwanip: Removing static route for monitor 8.8.8.8 and adding a new route through WG_VPN_GW_IP
Aug 15 21:16:38 	php-fpm 	446 	/rc.newwanip: Removing static route for monitor 1.1.1.1 and adding a new route through WAN_GW_IP
Aug 15 21:16:37 	check_reload_status 	484 	Reloading filter
Aug 15 21:16:37 	check_reload_status 	484 	Restarting OpenVPN tunnels/interfaces
Aug 15 21:16:37 	check_reload_status 	484 	Restarting IPsec tunnels
Aug 15 21:16:37 	check_reload_status 	484 	updating dyndns GW_VPN2_gw
Aug 15 21:16:37 	rc.gateway_alarm 	80506 	>>> Gateway alarm: GW_VPN2_gw (Addr:8.8.4.4 Alarm:1 RTT:14837.011ms RTTsd:12222.434ms Loss:58%)
Aug 15 21:16:37 	php-fpm 	446 	/rc.newwanip: rc.newwanip: on (IP address: WAN_IP) (interface: WAN1[wan]) (real interface: igb0).
Aug 15 21:16:37 	php-fpm 	446 	/rc.newwanip: rc.newwanip: Info: starting on igb0.
Aug 15 21:16:36 	check_reload_status 	484 	Restarting IPsec tunnels
Aug 15 21:16:36 	check_reload_status 	484 	rc.newwanip starting igb0
Aug 15 21:16:27 	check_reload_status 	484 	Linkup starting igb0
Aug 15 21:16:27 	kernel 		igb0: link state changed to UP
Aug 15 21:16:23 	check_reload_status 	484 	Linkup starting igb0
Aug 15 21:16:23 	kernel 		igb0: link state changed to DOWN
Aug 15 21:16:18 	php-fpm 	445 	/rc.linkup: HOTPLUG: Configuring interface wan
Aug 15 21:16:18 	php-fpm 	445 	/rc.linkup: DEVD Ethernet attached event for wan
Aug 15 21:16:17 	kernel 		igb0: link state changed to UP
Aug 15 21:16:17 	check_reload_status 	484 	Linkup starting igb0
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                  • stephenw10S
                    stephenw10 Netgate Administrator
                    last edited by

                    That log message is created by interface recursions such as a tunnel trying to open connections inside itself. The last time I saw this it was because of peer IPs that were defined as IPs inside the tunnel subnet:
                    https://forum.netgate.com/topic/168357/system-log-tun_wg0-loop-detected

                    However, since you're not seeing this continually it seems very likely that the default gateway setting being via the WG tunnel is causing problems when it fails or perhaps when it recovers.

                    If you don't configure the system default gateway to be the WG gateway and instead use policy based routing does it stop those logs?

                    Steve

                    1 Reply Last reply Reply Quote 0
                    • M
                      Mixka
                      last edited by

                      I did lot of testing. Really pulled out my hairs out.

                      TL;DR: After I let my WAN interface DHCP lease to expire I changed interface MAC address to make sure that I got another IP. With new IP everything is working as should.

                      Really nice :)

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